Liber LXV, Cap II, v. 41-42
41. Then the bird desired exceedingly this bliss, and laying down its wings became a faun of the forest.
42. The harper also laid down his Pan-pipe, and with the human voice sang his infinite tunes.
Gradual uplifting-transformation continues. Now is Ruach awakened to its harmonious fullest, and is ripe, ready for the next step. Human voice singing infinite tunes gives an image of the method of initiation at this stage.